Lifting-jack.



Patented Au l4, I900.

.M. m. manna. LlFTlNfi JACK.

V (Application flle'd June 7, 1900.)

3 Sheets-Sheet I,

(No Modal.)

No. 655,907. PatentedAug. l4, I900. M. M. MOORE.

LIFTING JACK.

(Application filed June 7, 1900.)

3 Sheets-Sheet- 2 (No Model.)

fwz M J m: Ncmus PEYERS co. I'HQTO-LITHD. WASHINGTON, u r

Patented Aug. 14, 1900.

M. M. MOORE.

- LIFTING JACK.

(Applicati on filed June 7, 1900.)

3 SheetsSheet 3, I

(No Model.) I

llnrrnn drnrns MOSES M. MOORE, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO THE Q d: C COMPANY, OFCHICAGO, ILLINOIS.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 655,907, dated August 14, 1900.

Application filed June 7, 1900. Serial No 19,417. (No model.)

T0 at whom it may concern:

Be it known that 1, Moses M. MOORE, a citizen of the United States, residing at Chicago Heights, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Lifting-Jacks; and I hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to construct and use the same.

My invention relates to hoisting mechanism, and, more particularly stated, to certain improvements in lifting-jacks of the lever, bar, and clutch-loop order, comprising an operating-lever, a lifting-bar, a hoisting-block, a retaining-block, and novel means for applying the power of said operating-lever to movable parts, as also for quickly releasing the latter and resetting the jack for further use.

The primary object of these improvements therefore is the construction of a compact, durable, and reliable tool wherein is com bined certainty of action andgreat lifting power. v

The invention will be hereinafter described, and particularly pointed out in the claims following.

I11 the accompanying drawings, which form part of this specification, and whereon like letters indicate corresponding parts in the several views, Figure l representsa side elevation of my invention, showing the liftingbar slightly elevated or projected from the shell of the implement. vation of same with the operating-lever removed and with the lifting-bar depressed or at its lowermost position. Fig. 3 is a central vertical section of the invention with partsin the same relative position as that shown by Fig. 2. Figs. 4, 5, and 6 are transverse horizontal sections taken at the lines 4, 5,and 6, respectively, of Figs. 1, 2, and 3. Figs. 7 and 8 are plan views of lifting and retaining blocks, respectively, by agency whereof the lifting-bar of the jack is manipulated.

Reference being had to the drawings and letters thereon, A indicates the base-plate,

Fig. 2 is a rear ele-v surface of base-plate A and cast integral therewith is the hollow body or shell of the structure, comprising side walls C C, divided into two compartments D E by the vertical I- I, the latter being adjustably retained in place by through-bolts I) Z) and constituting effective journal or fulcrum bearings for the main operating-lever, as will later appear.

Upon their exterior walls C C may be reinforced by vertical ribs 0 a, rising directly from base-plate A and merging into said side walls at points approximating their vertical center, While in like manner the surface of said baseplate A may be strengthened by a longitudinal rib, such as d, and by a transverse connecting-rib e, as best illustrated in Fig. 4.

Within compartment D is the main reciproeating lifting-bar J, finished by an enlarged head or cap K atits upper end and at its lower by a horizontally-projecting foot L, said head or foot either being adapted to receive the weight or load when the jack is in service. The bar .I is accordingly retained in operative positionby means of the aperture aforesaid in top G in conjunction with a transverse bracket or shelf M, connecting the front edges of sides C C, and by other means later to be noted.

Within compartment E is avertically-movable actuating-bolt N, with beveled upper surface f, the cross-sectional area whereof in the present illustration is circular, the same being indented, as at g, and consequently shouldered at h i, as shown, there also being a transverse trough-shaped groove j formed in the under side of said shoulder h, all for receiving the end of an operating-lever and a coacting pawl whereby the bolt N may be recip'rocated. At their rear edges sides C C are connected by upper and lower bridges or ledges O P, respectively, by preference cast integral with said sides and incidentallyserving to tie them more effectually together. The ledge P, it will be noted by reference to Fig. 3, is in the same horizontal plane with front bracket M, said ledge and bracket forming a support for lifting block or loop Q, normally resting thereon. At this point in the structure or intermediate of said ledge and bracket the central vertical partition F is interrupted, as at 7a, to permit passage of lifting-block Q, the latter in turn being broken at R to permit passage therethrough of the lifting-bar J, this opening B being of liberal dimensions, but in substantial conformity with .the outlines of said bar J. The liftingblock Q at its center, in rear of the bar-opening R aforesaid, is further perforated by aperture S,through which passes loosely a cap-screw T, in threaded connection with the upper end of actuating-bolt N,as illustrated by Fig. 3, in order to insure the proper reverse or downward movement of the lifting-block, as will be set forth in a statement of operation to follow. Immediately above ledge P is the corresponding transverse ledge O aforesaid, and upon this rests a second or retaining block U, Fig. 7, corresponding in all respects with block Q, except for the absence of screw-aperture S and the fact that in its normal position this block occupies an oblique angle with relation to the lifting-bar J, upon which it impinges, and thereby holds the load when lifting-bar J is released by the lifting-block. At its front edge this retaining-block U is located above a cross-shaft V, journaled in opposite sides 0 G of the structure, said shaft having upon its surface suitable cams Z Z, by rotation of which the front end of block U may be elevated and further equipped at its projecting end m with a gravitating handle WV. By agency of this handle IV cams Z Zare normally depressed, or, on the other hand, the shaft aforesaid may be quickly rotated for the purpose of leveling the block U according to requirements and when returned to normal position is arrested by pin or stop at, projecting from one side 0.

The letters X Y indicate a two-part operating-lever adjust-ably connected at Z by oppositely-disposed ratchet-teeth o and a central retaining-bolt II for locking said leversections in operative position after adjustment. The lever member Y upon its inner end has oppositely-projecting trunnions III III, bearing in bushings I I of yokes H II, hereinbefore described,and constituting fulcrumpins for the operating-lever. Beyond these said member Y terminates in parallel perforated lngs IV IV, through which passes a pin VI, mounting a pawl VII in pivotal relation, as best shown by Fig. 3, such pawl being practically housed by the indentation g of actuating-bolt N, its upper end snugly engaging the transverse depression j beneath shoulder 71. and its lower end resting upon the lower shoulder 2'.

From the upper end of one side 0 is pivoted a handle p, as illustrated by Fig. 2, for convenience in transporting the jack, while in similar relation with top G of the structure is a Vertically-swinging latch q, arranged to engage a loop or eye 7, projecting from the operating-lever X, for compactly retaining the latter in a Vertical position when not in use. At the opposite or rear side of the lowermost lever member Y is a projecting spur s, the purpose whereof is to limit a downward movement of the lever by engagement with the vertical strengthening-rib t on the back a of the implement, as shown by Fig. 1.

WVhile the foregoing is a description of the present invention in its preferred form of construction, it should be understood that I by no means limit myself tovsuch particular arrangement and combination of parts, which may be variously changed and modified, particularly in matter of. form, without departing from the spirit of the invention hereinafter claimed. For example, lifting-bar J may be circular, oval, or of other form in crosssection, all cooperating parts being modified accordingly. Likewise the actuating-bolt N may be of other form than that shown and the construction of other elements largely a matter of choice and expediency of manufacture.

The operation of this invention, therefore, in its present embodiment may be briefly stated as follows: A Weight or load to be operated upon having been placed on head K or upon foot L of the lifting-bar J, main operating-lever X Y is released from its latched vertical position (shown by Fig. 3) and is depressed, turning upon its trunnio'ns III III and yokes H H for a fulcrum. As a consequence of this movement pawl VII, pivotally mounted upon the inner extremity of said lever, elevates the actuating-bolt N, and in turn the lifting-block Q, which thereupon assumes an oblique angle to the longitudinal axis of bar J, biting same at opposite points or at the upper and lower edges back and front, respectively, of opening B. By further movement of the operating-lever said liftingblock and bar are elevated bodily, the latter in the meantime running freely through open ing R of retainingblock U until the limit of this stroke has been reached. This accomplished, block U goes into action, engaging or biting bar J in like manner as did block Q, and, as illustrated by Fig. 3, securely retaining bar J with its load pending a repetition of the lifting action. It will therefore be noted that power is applied at points below the lifting and retaining blocks rather than above the friction members, thus greatly reducing the necessary height of the structure and proportionately enhancing its usefulness.

IVhen occasion arises for returning bar J to its initial or lowermost position, this is speedily and effectually accomplished by a partial rotation of cross-shaft V under influence of its handle W, causing cams ZZ upon said shaft to forcibly elevate block U out of engagement with the lifting bar J, thus withdrawing its support. In practice it will be noted undue upward movement of retaining-block U at its free end is positively prevented by contact with the under side of top G, and similarly an abnormal downstroke of lifting-block Q is prevented by the front bracket M. On the other hand, should the last-named block become jammed upon bar J, refusing to be readily seated upon ledge P, its reverse or downward movement is insured by action of cap-screw T in threaded connection with the descending bolt N.

In the use of lifting-jacks it not infrequently happens that the object to be moved oroperated upon is somewhatinaccessible, for which reason all unnecessary projections in the present construction are carefully avoided and the projecting operating-lever X Y is designed to be partially folded when occasion requires. This is accomplished by loosening bolt II, partially rotating the two sections of ratchet connection Z one way or the other according to circumstances, and finally by resetting said bolt II in operative relation.

A description of the invention, its use, and operation being substantially as set forth, What I claim, and desire to secure by Letters Patent, is-

1. In a lifting-jack the combination with a supporting-frame and a lifting-bar, of lifting and retaining blocks adapted to engage said bar a1ternately,an actuating-bolt reciprocally mounted in the frame and means for reciproeating said actuating-bolt, substantially as described.

2. In a lifting-jack the combination with a supporting-frame and a lifting-bar, of lifting and retaining blocks adapted to engage said bar alternately the latter located above the former, an actuating-bolt reciprocally mounted in the frame beneath said lifting-block, and means for reciprocating said actuatingbolt, substantially as described.

3. In a lifting-jack the combination with a supporting-frame a lifting-bar and an operating lever, of lifting and retaining blocks adapted to engage said bar alternately, and an actuating-bolt reciprocally mounted in controllable connection with the first-named block and with the lever aforesaid, substantially as described.

4. In a lifting-jack the combination with a supporting-frame a lifting-bar and an operating-lever, of superposed lifting and retaining blocks adapted to alternately engage said bar in tilting relation, and an actuating-bolt reciprocally mounted having a beveled end in controllable connection with the first-named block and with the lever aforesaid, substantially as described.

5. In a lifting-jack the combination with a supporting-frame a lifting-bar and an operating-lever, of lifting and retaining blocks adapted to engage said bar alternately, an actuating-bolt in controllable connection with the first-named block, and a pawl pivotally connecting said bolt and lever, substantially as described. I

6. In a lifting-jack the combination with a supporting-frame a lifting-bar and an operating-lever, of tilting lifting and retaining blocks adapted to engage said bar alternately, a reciprocating bolt for actuating the liftingblock, and a pawl located within the confines of said actuating-bolt pivotally connecting same with the lever aforesaid, substantially as described.

7. In a lifting-jack the combination with a supporting-frame a lifting-bar and an adj ustable operating-lever, of lifting and retaining blocks adapted to engage said bar alternately, a recessed actuating-bolt, and a pawl located in the recess of said bolt and pivotally connected with the lever aforesaid, substantially as described.

8. In a lifting-jack the combination with a supporting-frame a lifting-bar and an operating-lever, of lifting and retaining blocks adapted to engage said bar alternately, a reciprocating bolt for actuating the liftingblock, and a cam-shaft journaled in the supporting-frame for disengaging the retainingblock, substantially as described.

9. In a lifting-jack the combination with a supporting-frame comprising two parallel compartments, of a lifting-bar located in one of such compartments, an actuating-bolt in the other compartment, an operating-lever fulcrumed upon the frame, a pivotal connection between said lever and bolt, a liftingblock and a retaining-block for alternately engaging said bar, and means for releasing the last-named block, substantially as described.

In testimony whereof I aftix my signature, in presence of two witnesses, this 31st day of May, 1900.

MOSES M. MOORE. Witnesses:

CLIFTON N. HILDUM, A. D. WINDSOR. 

